CN101785433A - Electronic metering device for milking in constant volume - Google Patents
Electronic metering device for milking in constant volume Download PDFInfo
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- CN101785433A CN101785433A CN 201010124454 CN201010124454A CN101785433A CN 101785433 A CN101785433 A CN 101785433A CN 201010124454 CN201010124454 CN 201010124454 CN 201010124454 A CN201010124454 A CN 201010124454A CN 101785433 A CN101785433 A CN 101785433A
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Abstract
The invention discloses an electronic metering device for milking in constant volume and aims to provide an electronic metering device for milking in constant volume, which has high detection accuracy. The electronic metering device mainly comprises an upper shell, a metering cavity and a lower shell and also comprises a constant volume cavity, a valve body and a two-phase gas and liquid flow separating pipeline, wherein the constant volume cavity is arranged between the metering cavity and the lower shell, and the metering cavity and the constant volume cavity are firmly connected in series from top to bottom and are hermetically installed through the upper shell and the lower shell; the valve body is arranged between a circular passage for milk to flow and a circular passage for discharging milk; the two-phase gas and liquid flow separating pipeline passes through the metering cavity along the axial direction; the upper port of the two-phase gas and liquid flow separating pipeline extends out of the upper cone of the metering cavity and is communicated with the inner cavity of the upper shell; and the lower port of the two-phase gas and liquid flow separating pipeline is communicated with the constant volume cavity. The invention is suitable for dynamic volumetric metering of milking volume of mechanized milking stations.
Description
Technical field
The invention belongs to a kind of instrument of measuring the milk volume in the herding milking equipment, especially relate to a kind of electronic metering device for milking in constant volume.
Background technology
At present, when China's milking station measures the amount of milking, generally adopt two kinds of metering methods, a kind of is static weighing, and another kind is a dynamic volumetric metering.What China's product generally adopted is static weighing, and external like product adopts dynamic volumetric metering.Static weighing generally all adopts modes such as weighbridge, platform balance, the metering of bottle formula to carry out, and not only require great effort during the operation of this kind metering method, take a lot of work, time-consuming, complex steps, manageability not, and have the shortcoming of the low and secondary pollution of precision.Existing external metering method is dynamic positive displacement, and it utilizes floating ball sensor to carry out liquid level control, and the control point has two, and one is high liquid level, and another is low liquid level.When liquid level reached high liquid level in the measurement chamber, the bottom valve of measurement chamber was opened, and milk beginning is discharged downwards, and liquid level descends, when liquid level in the measurement chamber is reduced to low liquid level, and valve breakdown, one time volume measurement finishes.Continue to gather milk measures next time.This technical scheme efficiently solves continuous detection of dynamic and avoids the secondary pollution problem of static weighing.But part still has some deficits: promptly in the milk discharge process, milk also continuing to gather afterflow, makes actual displaced volume greater than metered volume, and the volume that has more can only be recompensed with row's milk time (T+ Δ t) software, and this is to produce one of reasons of error.Because this kind metering method is the switching value metering, there is not the concrete height of liquid level, so the milk collecting delay time arrives, assert the end of milking, the liquid level when milking end in the volume cup is not known, presses half cup error of calculation minimum.This is to produce two of reasons of error.Though its precision index is nominally ± 1.6%～± 2%, actual full accuracy can only reach ± and 2%～± 3%.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, provide a kind of accuracy of detection high electronic metering device for milking in constant volume.
For achieving the above object, the present invention adopts following technical proposals: electronic metering device for milking in constant volume of the present invention comprises the air valve electromagnet, air valve, take over, the milk suction tube, the jack-up spring, pneumatic cavity, leather cup, upper shell, the magnetic ball float, sensor, measurement chamber, row's milk pipe, testing circuit, lower house, clawpiece, electronic pulsator, the PLC controller, the valve body, valve-rod body, leather cup is arranged on the central duct place, upper end of upper shell, the valve body connects from central vertical and is installed in the measurement chamber, the top overhead of this valve body is below leather cup, this jack-up spring is installed in the upper surface of leather cup, and valve-rod body passes the jack-up spring and leather cup connects with the top of this valve body is fastening; The outer survey suit magnetic ball float of this valve body; One end of milk suction tube connects the inner chamber that the clawpiece other end is connected upper shell; Adapter is connected between air valve and the pneumatic cavity, the vacuum tube of air valve is connected on the milk suction tube, testing circuit is installed in the bottom of lower house, electronic pulsator is used to the variable vacuum that clawpiece provides to be needed, and two variable vacuum tubes of this electronic pulsator are connected with the input interface of clawpiece, and the air valve electromagnet is used for the opening and closing of one control air valve, the magnetic ball float is used for the signal source of sensor, testing circuit is used for detection signal is handled, and the PLC controller is used for the I/O control signal
Wherein:
The signal input part of air valve electromagnet links to each other with the signal output part of PLC controller;
The signal output part of testing circuit links to each other with the signal input part of PLC controller;
The signal input part of electronic pulsator links to each other with the signal output part of PLC controller;
Also comprise constant volume chamber, valve body, biphase gas and liquid flow separating pipe, the constant volume chamber is set between measurement chamber and lower house, and measurement chamber and constant volume chamber are connected in series the fit sealing installation up and down by upper shell and lower house; Valve body is by body, last end valve and following end valve are formed, body is designed to the cylindrical tube shape, constant volume is provided with upper spacer on the chamber, this upper spacer separates measurement chamber and constant volume chamber up and down, this upper spacer center is provided with milk stream circular channel, the medial surface of lower house is designed to back taper, this back taper is the bottom surface in constant volume chamber, be positioned at the center and the corresponding row of setting of the concentricity line of milk stream circular channel milk circular channel of this back taper, and communicate with row milk pipe, this valve body is arranged between milk stream circular channel and the row's milk circular channel, and this valve body is contained in the lower end of valve body by the upper end valve pocket, the last sealing surface of last end valve is a contact-making surface with the lower sealing surface of milk stream circular channel, the last sealing surface of the lower sealing surface of following end valve and row's milk circular channel is a contact-making surface, distance on the last end valve between sealing surface and the following end valve lower sealing surface is less than the distance between milk stream circular channel and the row's milk circular channel upper-lower seal face, and the difference of these two distances is the gap of stroke up and down of valve body; The biphase gas and liquid flow separating pipe passes measurement chamber vertically, the upper port of this biphase gas and liquid flow separating pipe is stretched out from the upper cone of measurement chamber, and communicate with the inner chamber of upper shell, and the upper port height of this biphase gas and liquid flow separating pipe is higher than the milk inlet of measurement chamber, the lower port of this biphase gas and liquid flow separating pipe sees through the upper spacer in constant volume chamber, and communicates with this constant volume chamber; The concentricity internal lining pipe that axially is provided with in this valve body, the center that valve body is installed in lower house is passed in the lower end of this internal lining pipe, be provided with sensor in the internal lining pipe, the quantity of this sensor is four, these four sensors are set in qually spaced in the internal lining pipe along high low level, and the signal output part of each sensor links to each other with the input of testing circuit respectively.
Improvement as electronic metering device for milking in constant volume of the present invention, on the top center line of described upper shell, be positioned at the pneumatic cavity top milk valve electromagnet is installed, valve-rod body cooperates with the fixed core of this milk valve electromagnet as moving iron core realizes that adhesive separates control, this milk valve electromagnet is used for jointly controlling with the jack-up spring goes up closing and opening end valve following the time or jointly controlling and going up opening and closing following end valve time of end valve of end valve, and this signal input part of suckling the valve electromagnet links to each other with the signal output part of PLC controller.
After adopting technique scheme, the invention has the beneficial effects as follows:
1. the constant volume chamber is set between measurement chamber and lower house, and by upper shell and lower house measurement chamber and constant volume chamber are connected in series fit sealing up and down and install, promptly also have a constant volume chamber under measurement chamber, milk flows into the constant volume chamber earlier from the upper spacer center milk stream circular channel of measurement chamber by the constant volume chamber, when treating that milk is full of the constant volume chamber, last end valve cuts out, and descends end valve to open simultaneously, and milk discharges again, it is the static measurement of detection of dynamic, has effectively overcome the error that the milk afterflow produces;
2. the biphase gas and liquid flow separating pipe passes measurement chamber vertically, upper port is stretched out from the upper cone of measurement chamber, and communicate with the inner chamber of upper shell, and the upper port height of this biphase gas and liquid flow separating pipe is higher than the milk inlet of measurement chamber, and the lower port of this biphase gas and liquid flow separating pipe communicates with this constant volume chamber.Can effectively avoid milk to enter the constant volume chamber on the one hand by the gas-liquid two-phase circulation road; Suckling on the other hand flows into the process in constant volume chamber from measurement chamber, and bubble upwards floats by the biphase gas and liquid flow separating pipe in the milk, makes milk liquid be full of the constant volume chamber, effectively overcomes the error that bubble produces.In the present invention, the flow velocity of liquid and the type of flow do not impact its measuring accuracy,
3. the magnetic ball float is as sensor source signal, and the sensor received signal is analog quantity output, and demarcating up and down, 2 threshold values are switching value.Milk when finishing when thinking, according to the height of magnetic ball float, the milk amount of last glass of analog measurement is added up the milk amount that the pairing milk amount of constant volume chamber emptying number of times adds analog measurement at last, obtains variable, i.e. constant volume measurement+analog quantity metering.Make variable more near actual volume.
In sum, the accuracy of detection height of electronic metering device for milking in constant volume of the present invention draws precision by experiment and brings up to smaller or equal to ± 1.5%.
Description of drawings
Fig. 1 is that electronic metering device for milking in constant volume of the present invention is annotated milk status architecture schematic diagram;
Fig. 2 is the partial enlarged drawing of I among Fig. 1;
Fig. 3 is the partial enlarged drawing of II among Fig. 1;
Fig. 4 is that the present invention annotates milk constant volume measurement initial state structural representation;
Fig. 5 is the partial enlarged drawing of III among Fig. 4;
Fig. 6 is that the present invention annotates milk constant volume measurement done state structural representation;
Fig. 7 is that the present invention arranges milk and annotates milk initial state structural representation simultaneously.
Among the figure: air valve electromagnet 1 air valve 2 is taken over the 14 times end valves in end valve 13 constant volume chambeies, 15 row's milk pipes, 16 testing circuits, 17 lower houses, 18 clawpieces, 19 electronic pulsators, 20 PLC controllers, 21 biphase gas and liquid flow separating pipes, 22 valve bodys, 23 valve-rod bodies, 24 valve bodies 25 on 3 milk valve electromagnet, 4 milk suction tubes, 5 jack-up springs, 6 pneumatic cavity, 7 leather cups, 8 upper shells, 9 magnetic ball floats, 10 sensors, 11 measurement chamber 12
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail:
The structure of electronic metering device for milking in constant volume of the present invention comprises air valve electromagnet 1, air valve 2, adapter 3, milk suction tube 5, jack-up spring 6, pneumatic cavity 7, leather cup 8, upper shell 9, magnetic ball float 10, sensor 11, measurement chamber 12, row's milk pipe 16, testing circuit 17, lower house 18, clawpiece 19, electronic pulsator 20, PLC controller 21, valve body 23, valve-rod body 24 as shown in Figure 1.In Fig. 1, Fig. 2, leather cup 8 is arranged on the central duct place, upper end of upper shell 9, valve body 23 connects from central vertical and is installed in the measurement chamber 12, the top overhead of this valve body 23 is below leather cup 8, this jack-up spring 6 is installed in the upper surface of leather cup 8, and valve-rod body 24 passes jack-up spring 6 and leather cup 8 connects with the top of this valve body 23 is fastening; In Fig. 3, the outer survey suit magnetic ball float 10 of this valve body 23; In Fig. 1, an end of milk suction tube 5 connects the inner chamber that clawpiece 19 other ends are connected upper shell 9; Taking over 3 is connected between air valve 2 and the pneumatic cavity 7; The vacuum tube of air valve 2 is connected on the milk suction line 5; Testing circuit 17 is installed in the bottom of lower house 18; Electronic pulsator 20 is used to the variable vacuum that clawpiece 19 provides to be needed; Two variable vacuum tubes of this electronic pulsator 20 are connected with the input interface of clawpiece 19; Air valve electromagnet 1 is used for the opening and closing of control air valve 2; Magnetic ball float 10 is used for the signal source of sensor 11; Testing circuit 17 is used for detection signal is processed; PLC controller 21 is used for the I/O control signal
Wherein:
The signal input part of air valve electromagnet 1 links to each other with the signal output part of PLC controller 21;
The signal output part of testing circuit 17 links to each other with the signal input part of PLC controller 21;
The signal input part of electronic pulsator 20 links to each other with the signal output part of PLC controller 21;
As shown in Figure 1, also comprise constant volume chamber 14, valve body 25, biphase gas and liquid flow separating pipe 22, between measurement chamber 12 and lower house 18, constant volume chamber 14 is set, and measurement chamber 12 and constant volume chamber 14 are connected in series the fit sealing installation up and down by upper shell 9 and lower house 18; Valve body 25 is by body, last end valve 13 and following end valve 15 are formed, body is designed to the cylindrical tube shape, on the constant volume chamber 14 upper spacer is set, this upper spacer separates measurement chamber 12 and constant volume chamber 14 up and down, this upper spacer center is provided with milk stream circular channel, the medial surface of lower house 18 is designed to back taper, this back taper is the bottom surface in constant volume chamber 14, be positioned at the center and the corresponding row of setting of the concentricity line of milk stream circular channel milk circular channel of this back taper, and communicate with row milk pipe 16, this valve body 25 is arranged between milk stream circular channel and the row's milk circular channel, and this valve body 25 is sleeved on the lower end of valve body 23 by last end valve 13, the last sealing surface of last end valve 13 is a contact-making surface with the lower sealing surface of milk stream circular channel, the last sealing surface of the lower sealing surface of following end valve 15 and row's milk circular channel is a contact-making surface, distance on the last end valve 13 between sealing surface and following end valve 15 lower sealing surface is less than the distance between milk stream circular channel and the row's milk circular channel upper-lower seal face, and the difference of these two distances is the gap of stroke up and down of valve body 25; Biphase gas and liquid flow separating pipe 22 passes measurement chamber 12 vertically, the upper port of this biphase gas and liquid flow separating pipe 22 is stretched out from the upper cone of measurement chamber 12, and communicate with the inner chamber of upper shell 9, and the upper port height of this biphase gas and liquid flow separating pipe 22 is higher than the milk inlet of measurement chamber 12, the lower port of this biphase gas and liquid flow separating pipe 22 sees through the upper spacer in constant volume chamber 14, and communicates with this constant volume chamber 14; In Fig. 1, Fig. 2, the concentricity internal lining pipe that axially is provided with in this valve body 23, the center that valve body 25 is installed in lower house 18 is passed in the lower end of this internal lining pipe, be provided with sensor 11 in the internal lining pipe, the quantity of this sensor 11 is four, these four sensors 11 are set in qually spaced in the internal lining pipe along high low level, and the signal output part of each sensor 11 links to each other with the input of testing circuit 17 respectively.
In the preferred version as shown in Figure 1 and Figure 2, on the top center line of described upper shell 9, be positioned at pneumatic cavity 7 tops milk valve electromagnet 4 is installed, valve-rod body 24 cooperates with the fixed core of this milk valve electromagnet 4 as moving iron core realizes that adhesive separates control, this milk valve electromagnet 4 is used for jointly controlling with jack-up spring 6 goes up closing and opening following end valve 15 time or jointly controlling and going up opening and closing following end valve 15 time of end valve 13 of end valve 13, and this signal input part of suckling valve electromagnet 4 links to each other with the signal output part of PLC controller 21.
Electronic metering device for milking in constant volume of the present invention is the static measurement of detection of dynamic, and its principle is that constant volume adds the analog quantity precise metering, i.e. constant volume measurement+analog quantity metering.Constant volume measurement is the number of times that the volume fixed totals, and to be sensor detect demarcation to the place liquid level of magnetic ball float in the analog quantity metering, makes variable more near actual volume.
Metering process divided for three steps: the first step is carried out constant volume measurement, accumulative total constant volume chamber emptying number of times.Second step, when time-delay certain hour not enough during one glass of capacity, assert ends of milking, then carry out analog quantity and measure.The 3rd step, constant volume measurement value and analog measurement value are added up, can obtain measuring numerical value.
The measure control process is specific as follows:
The present invention annotates milk status architecture schematic diagram as shown in Figure 1.
The present invention annotates milk constant volume measurement initial state structural representation as shown in Figure 4.
Along with milk liquid level in the measurement chamber 12 raises, magnetic ball float 10 rises, when judging enough one glass, sensor 11 output signals, PLC controller 21 output control signals make air valve electromagnet 1 and 4 outages simultaneously of milk valve electromagnet, taking over 3 communicates with atmosphere, as shown in Figure 5, pneumatic cavity 7 is in atmospheric condition, leather cup 8 downward returns, jack-up spring 6 falls after rise, valve-rod body 24 separates with fixed core, and end valve 13 is opened on this moment, end valve 15 cuts out simultaneously down, milk stream circular channel between constant volume chamber and the measurement chamber is opened, and milk begins to flow in the constant volume chamber from measurement chamber 12.
The present invention annotates milk constant volume measurement done state structural representation as shown in Figure 6.
Milk liquid constantly flows into the constant volume chamber, is full of the constant volume chamber up to milk liquid, and milk flows into the process in constant volume chamber from measurement chamber, and bubble upwards floats by biphase gas and liquid flow separating pipe 22 in the milk, makes milk liquid be full of the constant volume chamber, effectively overcomes the error that bubble produces.In the present invention, the flow velocity of liquid and the type of flow do not impact its precision.
The present invention arranges milk and annotates milk initial state structural representation simultaneously as shown in Figure 7.
After liquid to be suckled is full of the constant volume chamber, set value for 2 seconds according to the time experience of being full of, PLC controller 21 output control signals make air valve electromagnet 1 and 4 power supplies simultaneously of milk valve electromagnet, end valve 13 cuts out on this moment, end valve 15 is opened simultaneously down, milk stream circular channel between constant volume chamber and the measurement chamber turn-offs, the bottom liquid outlet of constant volume chamber is opened, and milk liquid is discharged rapidly in the constant volume chamber, has effectively overcome the error that the milk afterflow produces.Metering process and so forth circulates.Milk when finishing when thinking, according to the height of magnetic ball float, the milk amount of last glass of analog measurement is added up the milk amount that the pairing milk amount of constant volume chamber emptying number of times adds analog measurement at last, obtains variable, and metering finishes.
Claims (2)
1. electronic metering device for milking in constant volume, comprise air valve electromagnet (1), air valve (2), take over (3), milk suction tube (5), jack-up spring (6), pneumatic cavity (7), leather cup (8), upper shell (9), magnetic ball float (10), sensor (11), measurement chamber (12), row's milk pipe (16), testing circuit (17), lower house (18), clawpiece (19), electronic pulsator (20), PLC controller (21), valve body (23), valve-rod body (24), leather cup (8) is arranged on the central duct place, upper end of upper shell (9), valve body (23) connects from central vertical and is installed in the measurement chamber (12), the top overhead of this valve body (23) is below leather cup (8), this jack-up spring (6) is installed in the upper surface of leather cup (8), and valve-rod body (24) passes fastening connection of top of jack-up spring (6) and leather cup (8) and this valve body (23); The outer survey suit magnetic ball float (10) of this valve body (23); One end of milk suction tube (5) connects the inner chamber that clawpiece (19) other end is connected upper shell (9); Taking over (3) is connected between air valve (2) and the pneumatic cavity (7), the vacuum tube of air valve (2) is connected on the milk suction tube (5), testing circuit (17) is installed in the bottom of lower house (18), electronic pulsator (20) is used to the variable vacuum that clawpiece (19) provides to be needed, two variable vacuum tubes of this electronic pulsator (20) are connected with the input interface of clawpiece (19), air valve electromagnet (1) is used for the opening and closing of one control air valve (2), magnetic ball float (10) is used for the signal source of sensor (11), testing circuit (17) is used for detection signal is handled, PLC controller (21) is used for the I/O control signal
Wherein:
The signal input part of air valve electromagnet (1) links to each other with the signal output part of PLC controller (21);
The signal output part of testing circuit (17) links to each other with the signal input part of PLC controller (21);
The signal input part of electronic pulsator (20) links to each other with the signal output part of PLC controller (21);
It is characterized in that: also comprise constant volume chamber (14), valve body (25), biphase gas and liquid flow separating pipe (22), between measurement chamber (12) and lower house (18), constant volume chamber (14) is set, and measurement chamber (12) and constant volume chamber (14) is connected in series the fit sealing installation up and down by upper shell (9) and lower house (18); Valve body (25) is by body, last end valve (13) and following end valve (15) are formed, body is designed to the cylindrical tube shape, the constant volume chamber is provided with upper spacer on (14), this upper spacer separates measurement chamber (12) and constant volume chamber (14) up and down, this upper spacer center is provided with milk stream circular channel, the medial surface of lower house (18) is designed to back taper, this back taper is the bottom surface of constant volume chamber (14), be positioned at the center and the corresponding row of setting of the concentricity line of milk stream circular channel milk circular channel of this back taper, and communicate with row milk pipe (16), this valve body (25) is arranged between milk stream circular channel and the row's milk circular channel, and this valve body (25) is sleeved on the lower end of valve body (23) by last end valve (13), the last sealing surface of last end valve (13) is a contact-making surface with the lower sealing surface of milk stream circular channel, the last sealing surface of the lower sealing surface of following end valve (15) and row's milk circular channel is a contact-making surface, the distance that last end valve (13) is gone up between sealing surface and following end valve (15) lower sealing surface flows circular channel and arranges the distance of suckling between the circular channel upper-lower seal face less than milk, and the difference of these two distances is the gap of stroke up and down of valve body (25); Biphase gas and liquid flow separating pipe (22) passes measurement chamber (12) vertically, the upper port of this biphase gas and liquid flow separating pipe (22) is stretched out from the upper cone of measurement chamber (12), and communicate with the inner chamber of upper shell (9), and the upper port height of this biphase gas and liquid flow separating pipe (22) is higher than the milk inlet of measurement chamber (12), the lower port of this biphase gas and liquid flow separating pipe (22) sees through the upper spacer in constant volume chamber (14), and communicates with this constant volume chamber (14); The concentricity internal lining pipe that axially is provided with in this valve body (23), the center that valve body (25) is installed in lower house (18) is passed in the lower end of this internal lining pipe, be provided with sensor (11) in the internal lining pipe, the quantity of this sensor (11) is four, these four sensors (11) are set in qually spaced in the internal lining pipe along high low level, and the signal output part of each sensor (11) links to each other with the input of testing circuit (17) respectively.
2. electronic metering device for milking in constant volume according to claim 1, it is characterized in that: on the top center line of described upper shell (9), be positioned at pneumatic cavity (7) top milk valve electromagnet (4) is installed, valve-rod body (24) cooperates with the fixed core of this milk valve electromagnet (4) as moving iron core realizes that adhesive separates control, this milk valve electromagnet (4) is used for jointly controlling with jack-up spring (6) goes up closing and opening following end valve (15) time or jointly controlling and going up opening and closing following end valve (15) time of end valve (13) of end valve (13), and this signal input part of suckling valve electromagnet (4) links to each other with the signal output part of PLC controller (21).
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| CN 201010124454 CN101785433B (en) | 2010-03-16 | 2010-03-16 | Electronic metering device for milking in constant volume |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010124454 CN101785433B (en) | 2010-03-16 | 2010-03-16 | Electronic metering device for milking in constant volume |
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| CN101785433B CN101785433B (en) | 2011-10-05 |
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Cited By (6)
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| CN102783421A (en) * | 2011-05-18 | 2012-11-21 | 曹赛 | Milking digitizing intelligent electronic metering system |
| CN104186352A (en) * | 2014-08-10 | 2014-12-10 | 东北农业大学 | Individual cow milking information online monitoring equipment |
| CN106259000A (en) * | 2016-08-11 | 2017-01-04 | 南京丰顿科技股份有限公司 | The metering device of a kind of milk and method of work thereof |
| CN106706088A (en) * | 2016-12-15 | 2017-05-24 | 宁夏农垦贺兰山奶业有限公司 | Cow milk yield metering device |
| CN106714549A (en) * | 2014-09-24 | 2017-05-24 | 英特帕斯股份公司 | Double chamber volumetric milk meter |
| CN109099984A (en) * | 2018-09-17 | 2018-12-28 | 中车环境科技有限公司 | A kind of liquid metering device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106259000A (en) * | 2016-08-11 | 2017-01-04 | 南京丰顿科技股份有限公司 | The metering device of a kind of milk and method of work thereof |
| CN106706088A (en) * | 2016-12-15 | 2017-05-24 | 宁夏农垦贺兰山奶业有限公司 | Cow milk yield metering device |
| CN106706088B (en) * | 2016-12-15 | 2022-08-09 | 宁夏农垦贺兰山奶业有限公司 | Milk yield metering device for dairy cow |
| CN109099984A (en) * | 2018-09-17 | 2018-12-28 | 中车环境科技有限公司 | A kind of liquid metering device and method |
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| Publication number | Publication date |
|---|---|
| CN101785433B (en) | 2011-10-05 |
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